Postretirement Benefit Plans - Changes in Fair Value of Plan Assets of Pension Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Change in plan assets
Plan assets - December 31	$ 278.0	$ 257.0
Funded status at end of year	(254.6)	(343.0)
U.S. Pension Plans [Member]
Change in plan assets
Plan assets - January 1	247.1	182.3
Actual return on plan assets	35.4	22.6
Employer contributions	0.9	58.3
Benefits and expenses paid	(16.6)	(16.1)
Plan assets - December 31	266.8	247.1
Funded status at end of year	(14.4)	(56.5)
International Pension Plan [Member]
Change in plan assets
Plan assets - January 1	2.0	2.0
Actual return on plan assets	0.1	0.1
Employer contributions	2.8	3.0
Benefits and expenses paid	(2.9)	(3.1)
Plan assets - December 31	2.0	2.0
Funded status at end of year	(82.8)	(81.4)
Pension [Member]
Change in plan assets
Plan assets - January 1	249.1	184.3
Actual return on plan assets	35.5	22.7
Employer contributions	3.7	61.3
Benefits and expenses paid	(19.5)	(19.2)
Plan assets - December 31	268.8	249.1
Funded status at end of year	$ (97.2)	$ (137.9)